MFJ-854 RF Current Meter, 30mA-3A Accurate: Linearity compensation circuitry assures accurate measurements especially at low RF currents Wide Range: Measure RF current from as little as 1 mA to 3 amps in six ranges. Handheld Size: Weighs just 11 ounces Long Battery Life: Meter draws 3-mA, battery's service life approaches shelf-life andles most cables: Accepts cables up to approximately 1/2 inch in diameter